Automatic inertia-locked firearm with automatic hammer



June 20, 1950 E'GUN 2,512,014

' AUTOMATIC INERTIA-LOCKED FIREARM WITH AUTOMATIC HAMMER Filed July 29,1947 2 Sheets-Sheet 1 Rig. 7

INVENTOR HA/VJ [GU/V 1 ATTDR/VEYJ June 20, 1950 2,512,914

H. EGLIN AUTOMATIC INERTIA-LOCKED FIREARM WITH AUTOMATIC HAMMER FiledJuly 29, 1947 2 Sheets-Sheet 2 m mvTo/e HANS Eel/iv ax n'rromsvs warPatented June 20, 1950 WITH AUTOMATIC v Hans Eglin, Geneva, Switzerland,assignor to Ma.-

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chine Tool- Works OerIikon Administration Company, Zurich-Oerlikon;Switzerland, a;

company of Switzerland Application .iui'y 29,1947;-seria1-Nb.7e4;441

In'Switzerland November 13, 1942 Seotionl, Public Law 690, August 8,1946Patent expires November 13, 1962 In automatic inertia-locked firearmsthe movement o'fthe striker pin is brought about by a lever which, onreaching the firing position, butts against a cam or projection arrangedin the path of the breech block and, in consequence, the striker pinimpels forward. The rearward movement of the striker pin is also broughtabout by the same lever which, in the course of the rearward movement ofthe breech ;block, .again butts on the said cam or projection, thuscausing the striker pin to move rearwards.

It has now been found that the said lever which is controlledbythecamorjprojection arranged in the path of the breech block and bringsabout the movement of the striker pin, is liable to break if the weaponremains in use for some prolonged time. Th destruction of this levermoreover may take place through other circumstances, for instance,defects of material.

One consequence of the rupture of the said lever is that the cartridgeintroduced by the breech block is not fired. As a result, the breechblock strikes hard against the cartridge chamber and experience hasshown that under certain conditions the striker pin may be impelledforward to such an extent through this hard blow that a delayed ignitionof the cartridge takes place. Such a so-called delayed ignitionin whichthe cartridge is not ignited on the forward stroke of the breech blockbut only after the breech block has struck hard against the cartridgechamberhowever, is to be avoided. One aim of this invention is,therefore, to stop further firing in the event of the rupture of thesaid lever controlling the striker pin.

A further aim of the present invention is to provide a device ininertia-locked automatic firearms, by means of which it is made possibleto prevent a belated ignition of the cartridge in the event of therupture of the lever controlling the movement of the striker pin.

Accordingly, in an automatic inertia-locked firearm in which the strikerpin is actuated by a lever controlled by a cam or projection provided inthe path of the breech block, the present invention provides anadditional cam or projection carrying back the lever, and consequentlythe striker pin, as soon as the breech block runs beyond the normalfront reversal position. The result thus obtained is that in case thesaid lever controlling the movement of the striker pin should break andthe breech block strike hard against the cartridge chamber, the strikerpin will not be hurled forward under the eifect of inertia, andtherefore will not ignite the carzonims. (01. 89-151)" tridge, but ohthe'contrary will remain in its rearposition. i. e'., will reach thefiring position.

The accompanying drawingsfshow. one constructional embodiment ofthepresnt invention. On the drawings:;

Fig} 1 is a diagrammatic representation of an,

inertia-locked automatic firearm.

Fig.2 is a section through the firearmshowing the disposition of thestriker pin and of the members controlling it in the positions theyoccupy during the forward travel .of the breech block;

Fig. 3 is'a section through the firearm showing the dispositon of thestriker pin and of. the members controlling it in the firing position;

Fig. 4 is a section through the firearm showing the disposition of thestriker pin and of the members controlling it in the positions theyoccupy in the normal front reversal position;

Fig. 5 is a section through the firearm showing the disposition of thestriker pin and of the members controlling it where there is nocartridge in the chamber; and

Fig. 6 is a section through the firearm showing the disposition of thestriker pin and of the members controlling it in the positions theyoccupy after the rupture of the said lever controlling the striker pin.

Referring to the drawings:

The barrel I is inserted in the usual manner into the breech casing 2 inwhich the breech block 3 reciprocates. The breech block is connected bymeans of a cross-key t through the breech bar 5, with the tube 6 guidingthe recuperator spring 1 which is fitted round the tube. The striker pin9 is fitted in the breech block 3 in a central bore 8 and its strikerpoint is guided in a member it fitted in the breech block 3. The strikerpin comprises two shoulders H and I2 arranged on opposite sides of alever it pivotally arranged on a pin I l. The lever I3 is provided withtwo spaced finger-shaped projections l5 and it. In the breech casing 2is inserted a plate ll provided with two cam-like projections 88 and l9. The cartridge is designated by the reference numeral 20.

The working of the above described arrangement briefly is as follows:

On its forward travel the breech block 3 pushes a cartridge 20 into thecartridge chamber. As soon as the breech block has reached a definitefiring position the projection it on the lever 53 contacts the cam 18provided in the path of the breech block. The lever 13 is thus forced topivot round the pin M and thus causes the striker pin I 7 3 9 to strikethe cartridge 20 and to fire it (Fig. 3).

Fig. a shows the front reversal or the breech block when the cartridge20 is; fired. The pro-f jection [5 does not reach as far as the cam l9.If new the breech block again travels rearwards the projection 15 isforced upwards by the cam I8, thus causing the lever I3 again to pivotaround the pin l4 and carry back the striker pin 9- (Fig. 2).

Referring to Fig. 5, if there is. no. cartri ge in. the barrel thebreech block runsbeyond its nor-. mal front reversal position. In thiscase, however, the projection l5 comes; within the,- range of action ofthe cam l9 and the striker pin 9; is, carried rearwards.

The action is similar in the case ofa rupture of the projection l6 ofthe lever 13; Firing cannot take place in this case and there wouldarise the danger mentioned above, namely that with the hard impart ofthe breech block on. the car tridge chamber the striker pin 9 could behurled forward" and subsequently ignite the cartridge. o e e n. his as el e 13; is ca sed to revolve around the pin 14 by the projection l5shoulders, a cam-lever pivotally mounted in said breech block andadapted to engage consecutively said two shoulders to move said strikerpin forwardly and rearwardly, a forward proi ction and a.v rea pojection upon. said camlever, a. plate. upon saidf breech casing, aforward projection on said plate for engagement with the forwardprojection of said cam-lever in the event of the breakage of thecam-lever, and a rear projection on said plate which is engaged by therear projection of said cam-lever during the; reeiprocation of; saidbreech block to turn said cam-lever and; thereby operate said strikerpm. 2. Anautomatic inertia-locked firearm in accordancewith claim 1,wherein the forward projection err said plate is located at a distanceHANS REFERENCES, CITED The following references are of record in th filef thi p t nt:

UNITED STATES PATENTS Number Name Date 2,251,304 summerbell Aug. 5,,19411 FOREIGN BATENTS- Number Country Date 305,919 Great Britain Apr. 4,1929

